<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="flag=!flag">{{flag?'隐藏':'显示'}}</button>
        <p v-if="flag">v-v-if我显示了......</p>
        <h1 v-show="flag">v-show我显示了.......</h1>
    </div>
</body>
<script>
    new Vue({
        el: "#app",
        data() {
            return {
                flag: true
            }
        }
    })
</script>

</html>